package com.itheima.reggie.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.itheima.reggie.mapper.CategoryMapper;
import com.itheima.reggie.pojo.Category;
import com.itheima.reggie.pojo.Dish;
import com.itheima.reggie.pojo.Setmeal;
import com.itheima.reggie.service.CategoryService;
import com.itheima.reggie.service.DishService;
import com.itheima.reggie.service.SetmealService;
import com.itheima.reggie.util.CustomException;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

@Service
public class CategoryServiceImpl extends ServiceImpl<CategoryMapper, Category> implements CategoryService {


    @Autowired
    private DishService dishService;

    @Autowired
    private SetmealService setMealServices;

    /**
     * 根据id删除分类，删除之前进行判断是否关联套餐
     * @param id
     */
    @Override
    public void remove(Long id) {

        //查询分类是否关联菜品，如果已经关联，抛出一个业务异常
        LambdaQueryWrapper<Dish> lambdaQueryWrapperDish = new LambdaQueryWrapper<>();

        lambdaQueryWrapperDish.eq(Dish::getCategoryId,id);
        long count1 = dishService.count(lambdaQueryWrapperDish);

        if(count1 > 0){
            //如果已经关联菜品，抛出一个业务异常
            throw new CustomException("当前分类下关联了菜品，不能删除");
        }

        //查询分类是否关联套餐，如果已经关联，抛出一个业务异常
        LambdaQueryWrapper<Setmeal> lambdaQueryWrapperSetMeal = new LambdaQueryWrapper<>();

        lambdaQueryWrapperSetMeal.eq(Setmeal::getCategoryId,id);
        long count2 = setMealServices.count(lambdaQueryWrapperSetMeal);

        if(count2 > 0){
            //如果已经关联套餐，抛出一个业务异常
            throw new CustomException("当前分类下关联了套餐，不能删除");
        }

        //正常删除分类
        super.removeById(id);
    }
}
